Cannon-pinion for timepieces



(No Model.)

H. C. KLEIN.

CANNON PINION EUR TIMEPIEGES. No. 476,656. Patented June 7, 1892'.

MMSSES.

@jan wle/.xf PRR UNITED STATES PATENT OFFICE.

HENRY C. KLEIN, OF MUNOIE, INDIANA.

CANNON-PINION FOR TIMEPIECES.

SPECIFICATION forming part of Letters Patent No. 476,656, dated J' une 7', 1892.

Application filed May 19, 1890. Serial No. 352,297. (No model.)

To all whom it may concern:

l 'e t kno n alv I, HENRY C. KLEIN, a citt Zen of the United States, residing at Muncie, in the county of Delaware and State of Indiana, have invented certain new and useful Improvements in Pinions for Vatches and Clocks, of which the following is a specification.

Heretofore in watches and clocks it has been difficult to evenly adjust the frictional tension of what is known as the cannonpinion, both because of the inability to adjust the parts and because ofthe difiiculty in getting access to them, it having required the complete taking apart of the watch or clock to reach these parts for the purpose of adjustment.

The object of my said invention is to provide a means whereby this cannon-pinion in watches and clocks may be properly held upon the center pinion; and it consists iii providing the outer end of said center pinion with a longitudinal perforation, slitting it upon one or both sides thereof and inserting a screw-Wedge in said longitudinal perforations between the parts of the divided end, whereby they can when desired be forced apart against the interior surface of the cannon -pinion, which serves to give the desired amount of friction between the parts, as will be hereinafter more particularlydescribed and claimed.

Referring to the accompanying drawings, which are made a part hereof, and on which similar letters of reference indicate similar parts, Figure l is a full-sized front elevation of the face of the watch provided with my said invention; Fig. 2, afragmentary elevation, on a greatly-enlarged scale, similar to the central portion of Fig. l; Fig. 3, a central sectional view on the dotted line 3 3 in Fig 2; Fig. 4, a view similar to a portion of 3 except that the portion of the central pinion shown is in side elevation; and Fig. 5, aview similar to a portion of Fig. 3, except that the central pinion is slitted or divided on one side only of the longitudinal perforation.

In said drawings the portion marked A repiesents the central pinion; B, the cannonpinion, which carries the minute-hand B', C, the hour-wheel which carries the hourhand C, and D the face or dial of the watch or clock. All of these parts except the outer end of the central pinion are or may be of any usual or desired construction, and as they do not in themselves embody my present invention they will not be further described herein, except incidentally in describing` said invention.

The central pinion A, as hcreinbefore stated, is slitted or divided at its outer end, which end extends up through the dial of the watch or clock to the outside thereof and has an opening or longitudinal perforation formed in its end, which is tapped out or screwthreaded for the purpose of receiving a screw o, which acts as a wedge for forcing the two sides of the end of the center pinion apart and throwing them into closer contact with the interior of the cannon-pinion, thus increasing the friction to the desired extent. When, by reason of wear, the cannon-pinion comes to revolve too loosely upon the center pinion, the normal condition can be restored by simply giving this screw d a slight turn, spreading the sides of the center pinion slightly farther apart, as will be readily understood. As will also be seen, this can be done from the outside or face of the watch or clock without disturbing any other part, and thus not only a much better result is obtained than heretofore, but with a less expenditure of time and labor. In performing` these operations the screw does not need to be removed, but only turned slightly in its seat. I prefer to make the screw with a tapered or wedge-like head, as shown; but, as will be readily understood, the arrangement may be such that a plain straight screw will spread the ends between which it is placed and thus accomplish the same result, and therefore I do not desire to be understood as limiting myself to this particular form. I

IOO

shaped head adapted to be inserted in said perforation and thus force apart the ends of said center pinion, substantially as described, and for the purpose specified.

In Witness whereof I have hereunto Set my hand and seal, at Indianapolis, Indiana, this 14th day of May, A. D. 1390.

HENRY C. KLEIN. [L s] Vitnesses:

CHESTER BRADFORD, L. E. TALLENTIRE. 

